As a previous Wind Mobile user, I switched to Public mobile (owned by Telus) as they have the most fair USA rates.
The only option is a 10 day prepaid.
These add-ons can be used even on their cheap $10/ month plan (which is really $8/ month if you setup a credit card).
Their plans are cheap because you need to bring your own device and all customer service is through their website direct messaging.
Sims are currently free at wal-mart.
For $10 you get 250MB of DATA
$15 = 500MB of Data
$20 = 1 GB of Data for 10 days.
I still get Texts, by am too cheap to sign up for a US Texting plan.
I use Fongo to receive calls using the data and Google Hangouts to make calls using my data plan.
Here are the plan add-ons in their own words:
U.S. Talk, Text and Data Bundle
Unlimited Talk, International Text and 250MB Data for just $20 for 10 days.
U.S. Talk and Text Bundle
Unlimited Talk and International Text for just $15 for 10 days.
U.S. Talk Only
Unlimited Talk for just $8 for 10 days.
U.S. Text Only
Unlimited International Text for just $8 for 10 days.
U.S. Data Only
250MB Data for $10, 500MB Data for $15 and 1GB Data for $20 for 10 days.
When it comes to humility, I am the greatest!